Range Rover Automatic Transmission. Manual - part 7

1-13

Operation Pride

REPAIR

Check the following connectors for any signs of loose connectors, lack of terminal tension, water
ingress, terminals backed out or dirt/corrosion on the terminals:

In-line connector C551 (near coil pack) pins 4, 5 and 6

ECM connectors C505 pins 27 and 29 and C507 pin 31

If nothing was found during this inspection and the fault is still present, check in-line connector
C659 pins 1, 7 and 9 under the center console for any similar connector problems.

GEMS P1777 code

EFFECT: “CHECK ENGINE” light on

DESCRIPTION

The ignition retard line from the ECM to the TCM will have a PWM signal to identify any ignition
retard requests during normal operation of the TCM.
This line will also indicate a fault condition when the TCM sends a PWM of less than 10% or
greater than 93%.

CAUSE

This can also be caused by a variety of electrical connector/terminal problems between the ECM
and TCM.

REPAIR

Check the following connectors for any signs of loose connectors, lack of terminal tension, water
ingress, terminals backed out or dirt/corrosion on the terminals:

In-line connector C551 (near coil pack) pins 4, 5 and 6

ECM connectors C505 pins 27 and 29 and C507 pin 31

If nothing was found during this inspection and the fault is still present, check in-line connector
C659 pins 1, 7 and 9 under the center console for any similar connector problems.

System Information Document

____________________________________________________________________________________________________

 [Revision:   2.3]

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_
© Rover Group 1998

Page 1 of 52

ZF 

- 

4HP22EH

-

4.0l V8 vehicles

4HP24

-

4.6l V8 vehicles

BOSCH  - 

GS8.87.0

-

99MY Discovery Series II

GS8.87.1

-

99MY Range Rover

4 Speed Electronic

System

APPLICABILITY:

99MY Discovery Series II - 4.0 Petrol and 2.5 Turbo Diesel
99MY Range Rover - 4.0l and 4.6l Petrol Vehicles
99MY Range Rover Diesel transmissions are not covered by this document

DATE:

19

th

 May 1998

System Information Document

____________________________________________________________________________________________________
_
[ZF_4SPD\Project_Specs]

[Revision:   2.3]

____________________________________________________________________________________________________
_
© Rover Group 1998

Page 2 of 52

INDEX

1

INTRODUCTION.................................................................................................................................3

1.1

G

ENERAL

....................................................................................................................................................................... 3

2

VEHICLE INTERFACE REQUIREMENTS ....................................................................................4

2.1

B

LOCK 

D

IAGRAM

.......................................................................................................................................................... 4

2.2

I

NTERFACE SPECIFICATION

............................................................................................................................................ 5

2.2.1

Gear Shift Solenoids ................................................................................................................................................................ 5

2.2.2

Controller power supply .......................................................................................................................................................... 6

2.2.3

Serial information - inputs ....................................................................................................................................................... 7

2.2.4

Serial information – outputs .................................................................................................................................................... 7

2.2.5

Digital inputs ........................................................................................................................................................................... 7

2.2.6

Digital outputs ....................................................................................................................................................................... 13

2.2.7

Analogue inputs ..................................................................................................................................................................... 14

2.2.8

Diagnostic interface............................................................................................................................................................... 15

2.3

ECU C

ONNECTOR 

P

IN

-

OUT

......................................................................................................................................... 16

2.4

V

EHICLE CONNECTOR PIN OUTS

................................................................................................................................... 17

2.4.1

Diagnostic Connector ............................................................................................................................................................ 17

2.4.2

Harness to Position switch (mounted on Transmission)......................................................................................................... 17

2.4.3

Harness to Solenoid Valves (mounted on Transmission)........................................................................................................ 17

3

DESCRIPTION OF FUNCTIONALITY..........................................................................................18

3.1

S

PECIAL FEATURES

...................................................................................................................................................... 18

3.1.1

Sport Mode. ........................................................................................................................................................................... 18

3.1.2

Manual Mode......................................................................................................................................................................... 18

3.1.3

Towing / Driving up steep gradients ...................................................................................................................................... 18

3.1.4

Compensation for reduced engine torque .............................................................................................................................. 18

3.1.5

Calibration Selection (99MY V8 Range Rover Only) ............................................................................................................. 18

4

FAULT FINDING...............................................................................................................................19

4.1

F

IXING FAULTS

............................................................................................................................................................ 19

4.1.1

The transmission ECU is disconnected .................................................................................................................................. 19

4.1.2

The transmission has diagnosed a fault. ................................................................................................................................ 19

4.1.3

Power to the ECU has been lost or K line not connected....................................................................................................... 19

4.2

MIL 

LIGHT ILLUMINATION 

(N.A.S. 

VEHICLES ONLY

) ................................................................................................... 20

5

FAULT CODES ..................................................................................................................................21

5.1

A

MBIENT CONDITIONS STORED

.................................................................................................................................... 21

5.2

F

AULT CODES DESCRIPTIONS

....................................................................................................................................... 21

5.3

I

MPACT ON THE SYSTEM OF EACH FAULT

..................................................................................................................... 30

6

GENERAL INFORMATION ............................................................................................................31

6.1

D

IMENSIONS AND FIXING DETAILS

............................................................................................................................... 31

6.2

V

OLTAGE REQUIREMENTS

........................................................................................................................................... 31

7

FAULT TREE ANALYSIS ................................................................................................................32